The example at Carrowneden in County Mayo is a rath, the term used for a ringfort constructed primarily from earthworks rather than stone. A raised circular bank, often accompanied by a ditch, would once have enclosed a farmstead, sheltering a family, their animals, and their stores during the early medieval period, roughly between the fifth and twelfth centuries. That so many survive at all, even in eroded form, owes something to the unease they generated in later folklore; raths were widely believed to be fairy forts, and the farmer who ploughed one flat did so at considerable personal risk.

Carrowneden itself is a townland in Mayo, a county whose landscape is dense with earthwork monuments of this kind, many of them sitting quietly in rough pasture or along field boundaries with no particular marker to distinguish them. The placename element "carrow" derives from the Irish "ceathrú", meaning a quarter, a unit of land division that speaks to centuries of agricultural organisation long predating any modern map. Beyond its classification as a rath and its location in this townland, the documentary record for this particular site has not yet been made publicly available, which means the specific details of its dimensions, condition, and any associated finds remain, for now, out of reach.